'First child on way' for star Tennant
Moffett, 26, who recently got engaged to the former Doctor Who, is thought to be at least five months pregnant.
The new arrival will be Tennant's first child but Miss Moffett's second, as she has an eight-year-old son Tyler from a previous relationship.
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Hide AdThe couple were seen walking hand-in-hand close to their new home in south-west London recently, but any bump of Moffett's was difficult to spot under her thick winter coat.
A source said: "They are a couple who like to keep themselves to themselves. Friends and family are delighted."
Moffett's father, actor Peter Davison, played Doctor Who in the 1980s. Moffet starred as 0 the Doctor's daughter alongside Tennant's Time Lord.